scope not staying put...?


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~Abstract~
January 3, 2012, 12:07 PM
I've got a Marlin 60 that I stuck a Walmart Bushnell 4x20 on.

I was having trouble at the range with the zero wandering all around. Then I noticed that the scope mounts had nearly backed themselves off the rail. The front of the scope was touching the reciever.

I placed the scope and mounts back at the correct location...and retightened everything VERY WELL. I was concerned about the torque I was applying breaking something or stripping the threads.

Well several shots later...the darned mounts were moving BACK TOWARDS ME AGAIN! :banghead:

I called it a day and took the rifle home.


Suggestions?



Also...why is the scope moving rearward? I would assume it's due to the bolt smacking forward after the shot...but isn't the shot more powerful than the bolt slapping forward (which should cause the scope mounts to slide forward?)

I'm all confused.


HELP!

Thanks!

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Fleet
January 3, 2012, 12:17 PM
Sounds like your screws are coming loose. Loctite 242 on the screws will fix this.

RaceM
January 3, 2012, 12:26 PM
Locktite the screws. I've never had a scope come loose after doing so.

rcmodel
January 3, 2012, 01:28 PM
Forget the screws.

Clean & degrease the grooves on the receiver and scope ring clamps.

Now Lock-Tight the grooves under the clamps.

Let it set overnight to cure and it should not slip again.

rc

Chawbaccer
January 3, 2012, 01:33 PM
make sure the screws aren't running out of thread before thay are tight. Most 22 mounts will use a quarter to tighten, go ahead and use a pair of pliars too.

~Abstract~
January 3, 2012, 01:35 PM
OK...I'll acetone the rail...then locktite everything within spitting distance!


Thanks y'all!


RC, why no primers in a glass jar?
I'm not a reloader.

Smokey Joe
January 3, 2012, 03:15 PM
Are a nasty explosion waiting to happen. The glass jar will just add sharp bits of shrapnel to the mix.

Loose primers can set each other off when banged together. The safest storage for primers is the little slider box they were packed in, that doesn't allow the primers to touch each other.

There is a WWII-era story about a worker in an ammo factory, carrying a bucket of primers to the loading equipment, and jangling the bucket up and down as he walked. When the smoke cleared, all that could be found of the worker was one of his feet. Don't know if the story is apocraphal or not, but the lesson is, NEVER ALLOW PRIMERS TO BANG TOGETHER!!! If one goes off, all the rest will sympathetically detonate.

RC--Apologize for jumping in, but I felt that this ought to be answered ASAP.

On the original question: Loctite is real good for slippy 'scopes.

~Abstract~
January 3, 2012, 03:47 PM
Thanks all!


Any thoughts on why the scope is creeping rearward instead of forward?

rcmodel
January 3, 2012, 03:50 PM
As you surmised, the bolt is hitting the receiver harder going back forward then the recoil is pushing against the spring going back.

rc

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